The Linux Kernel - Routing

1. Decides on the packet's route according to:
   • The packet's IP destination
   • The routing table
2. If the destination is local, the Linux kernel passes the packet up to a higher protocol layer (e.g. TCP/UDP/ICMP).
3. If the destination is remote, the Linux kernel forwards the packet according to the routing decision (destination). It sends the packet at the end of the routing chain, using dev_queue_xmit.